JAK-Inhibitor Safety in Adolescents With AD Reported

WASHINGTON – Abrocitinib demonstrated an acceptable long-term safety profile in adolescents with moderate to severe atopic dermatitis (AD) in an integrated safety analysis of 635 adolescents and over 1,000 patient-years of exposure, Lawrence F. Eichenfield, MD, reported at the annual Revolutionizing Atopic Dermatitis conference.

In March 2023, the oral Janus kinase 1 (JAK1) inhibitor was approved by the Food and Drug Administration for treating adolescents aged 12-17 with refractory moderate to severe AD – an expanded indication from the approval in adults in 2022.

The new analysis evaluated data from patients who participated in the phase 3 JADE clinical trials – MONO-1, MONO-2, TEEN, and REGIMEN – and were subsequently enrolled in the ongoing phase 3 extension trial JADE EXTEND. Compared with a previous post hoc analysis in which adolescent patients had approximately 1 year of exposure, this updated analysis includes a sizable portion of patients with more than 96 weeks of exposure.

“We’re starting to get good numbers of [adolescents] who’ve had about 2 years of exposure,” said Dr. Eichenfield, professor of dermatology and pediatrics and vice chair of the department of dermatology at the University of California, San Diego, during a late-breaking research session.

With a data cut for this analysis of September 2021, “we haven’t seen additive long-term [adverse] effects” with longer exposures, he said. In addition, “there were no unique safety concerns related to adolescents compared to the findings observed [in an] integrated safety analysis using the same data cut in which most patients were adults.”

(The analysis in adults covered 3,802 patients with over 5,000 patient-years of exposure, and was presented at the annual American Academy of Dermatology meeting in March 2023.)

Also presented in the late-breaking abstract session at RAD 2023 was a long-term safety study of upadacitinib (Rinvoq), the other JAK1 inhibitor approved for adolescents with AD – approved by the FDA for both adolescents and adults with moderate to severe AD in 2022. The new analysis captures exposure of up to 4 years and shows no “worsening or accumulation of events,” compared with 1-year data, reported Christopher G. Bunick, MD, PhD, of the department of dermatology and the program in translational biomedicine at Yale University, New Haven, Conn.

Abrocitinib in adolescents

For the safety analysis of abrocitinib (Cibinqo), data were pooled into two cohorts: A consistent-dose cohort of 490 adolescents who received the same dose (200 mg or 100 mg) during the entire duration of the qualifying JADE trials, and a variable-dose cohort of 145 adolescents who received different doses (200 mg or 100 mg) during the JADE REGIMEN qualifying trial.

Duration of exposure was 96 weeks or more in 37%-38% of the consistent-dose cohort and 68% of the variable-dose cohort.

In the consistent-dose cohort, adverse events occurred in 243 (84%) and 153 (76%) of patients receiving 200-mg doses and 100-mg doses, respectively. Incidence rates for severe adverse events were 5.87 per 100 patient-years at both doses, and rates for adverse events leading to study discontinuation were 6.96/100 patient-years at 200 mg and 5.13/100 patient-years at 100 mg.

“No meaningful dose-response relationship was observed for serious adverse events, or adverse events leading to discontinuation, or adverse events of special interest,” said Dr. Eichenfield, also chief of pediatric and adolescent dermatology at Rady Children’s Hospital, San Diego.

The IRs of adverse events of special interest were 1.84/100 patient-years and 1.28/100 patient-years for serious infection; 2.11/100 patient-years, and 1.62/100 patient-years for all herpes zoster infections; and 0.69/100 patient-years and 0.32/100 patient-years for opportunistic herpes zoster infections in the 200-mg and 100-mg arms, respectively.

“Other than herpes zoster, there were no opportunistic infections observed and no tuberculosis cases,” he said. “There was one nonfatal venous thromboembolism in an adolescent who had a very strong family history of [pulmonary embolism], one retinal detachment [with a concurrent diagnosis of cataracts and of left eyebrow folliculitis], and no events of nonmelanoma skin cancer or other malignancies, major adverse cardiovascular events, or deaths.” The thromboembolism case was reported in the previous post hoc analysis.

In the variable-dose cohort, data were similar, Dr. Eichenfield said. The IRs for severe adverse events, adverse events leading to study withdrawal, and adverse events of special interest were consistent with those in the other cohort. And similarly, there were no reports of tuberculosis or other opportunistic infections (excluding herpes zoster), and no reports of nonmelanoma skin cancer (NMSC) or other malignancies, major adverse cardiovascular events (MACE), or death. In this cohort, there were no venous thromboembolism (VTE) reports.

Upadacitinib in adolescents, adults

The new analysis looked at up to 4 years of upadacitinib treatment in almost 2,700 adolescents and adults– and over 6,200 patient-years – using integrated data from three ongoing pivotal phase 3 studies: Measure Up 1, Measure Up 2, and AD Up. (Of these patients, 539 were adolescents, Dr. Bunick said after the meeting.)

In the Measure Up studies, patients were randomized 1:1:1 to receive a 15-mg dose, a 30-mg dose, or placebo once daily. In AD Up, patients in each arm received concomitant topical corticosteroids. At week 16, patients receiving the drug continued their assigned treatment during the ongoing blinded extension period, and those receiving placebo were rerandomized to upadacitinib 15 mg or 30 mg.

The exposure-adjusted event rates for any adverse event leading to discontinuation were 4.1/100 patient-years and 4.7/100 patient-years in patients receiving 15 mg and 30 mg, respectively, and the rates of any serious adverse event were 6.5/100 patient-years and 7.5/100 patient-years, Dr. Bunick reported. Three deaths occurred in the 30-mg group; all deaths were related to COVID infection and occurred in adults with cardiovascular risk factors.

Incidence rates of adverse events of special interest were similar to those in a previous 1-year analysis. The rate of serious infections per 100 patient years, for instance, was 2.3 and 2.8 in the 15-mg and 30-mg groups, respectively, compared with 2.2 and 2.8 in the 1-year analysis.

The rate of opportunistic infections, including eczema herpeticum (and excluding TB and herpes zoster), saw a slight bump in the new analysis to 2.4/100 patient-years with the 30-mg dose. Other event rates, across both dosages and durations, were less than 0.1/100 patient-years for active TB; 0.3-0.4/100 patient-years for NMSC, and 0.1/100 patient-years or below for other malignancies, MACE, and VTE. Herpes zoster had the highest event rate in both the 1- and 4-year analyses of between 3.1/100 patient-years and 5.8/100 patient-years, Dr. Bunick reported.

The adverse event rates for adolescents and adults “show consistency and are very low,” Dr. Bunick said. At 4 years, no new safety risks were identified.

“The more data…the better”

Data on the safety of new medications in children and adolescents is always important, and with systemic JAK inhibitors in particular, “the more data we can accumulate in [younger] patients with AD … the better,” said Robert Sidbury, MD, MPH, professor in the department of pediatrics at the University of Washington, Seattle, and chief of the division of dermatology at Seattle Children’s Hospital, who was asked to comment on the two studies.

Dermatologists have taken comfort in the fact that the “daunting” boxed warning on JAK inhibitors “was generated in a very different population than we generally propose to treat, certainly when talking about children and adolescents,” said Dr. Sidbury, who was not involved in either of the new safety analyses.

The JAK inhibitor boxed warning “reflects a study of tofacitinib – a different JAK inhibitor with arguably more risk of adverse effects – in adults over the age of 50 with rheumatoid arthritis and multiple risk factors for comorbidities included in the boxed warning,” he said.

“This allows dermatologists to reasonably conclude that the boxed warning – while critical to discuss and consider in every patient – is likely less concerning than might otherwise by implied.”

With more patient experience, “the more our assessment of risk, and of the ‘legitimacy’ of the boxed warning in our patient population, becomes evidence-based as opposed to extrapolation,” Dr. Sidbury said.

The two studies reported, he said, “detail an experience that is not adverse effect free –I have yet to find that medication – but is a reasonable profile considering the robust efficacy results they accompany.”

The abrocitinib safety analysis was sponsored by Pfizer. Regarding the study of upadacitinib, AbbVie contributed to the design of the safety analysis and participated in data collection. No honoria or payments were made to the authors, according to the study abstract. Dr. Eichenfield is a consultant/advisory board member for Pfizer and other companies, and has served on the speakers bureau/received honoria for Pfizer and other companies. Dr. Bunick is a consultant for AbbVie and other companies, and has served as an speaker/received honoraria or served as an investigator for several companies. Dr. Sidbury disclosed being a consultant/advisory board member for Lilly and Leo and serving on the speakers bureau/honoraria for Beiersdorf. All reported receiving grant/research support from various companies.

This article originally appeared on MDedge.com, part of the Medscape Professional Network.

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